example(a2a,nacos): For #293, Add example for a2a and nacos a2a registry.

[KomachiSion]

AgentScope-Java Version

1.0.7

Description

For #293 .

• example(a2a): add A2A protocol example with tools and Spring Boot app.
• chore(deps): Add Nacos extensions dependency into all-in-one and update documents.
• example(a2a,nacos): Add Nacos A2A registry and discovery example in a2a example module.

Checklist

Please check the following items before code is ready to be reviewed.

• Code has been formatted with mvn spotless:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

[Copilot]

Pull request overview

This PR adds comprehensive A2A (Agent-to-Agent) protocol support with examples and Nacos registry integration for AgentScope Java.

• Adds complete A2A protocol example application with Spring Boot integration
• Updates documentation to reflect Nacos client dependency change from custom extension to direct nacos-client dependency
• Includes Nacos A2A registry module in the all-in-one distribution package

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
docs/zh/task/a2a.md	Updates Nacos A2A dependency from custom agentscope extension to direct nacos-client
docs/en/task/a2a.md	Updates Nacos A2A dependency from custom agentscope extension to direct nacos-client
docs/zh/quickstart/installation.md	Adds Nacos Registry entry to dependency table with proper formatting
docs/en/quickstart/installation.md	Adds Nacos Registry entry to dependency table with proper formatting
agentscope-extensions-nacos-a2a/pom.xml	Sets nacos-client dependency as provided and optional for better dependency management
agentscope-nacos-spring-boot-starter/pom.xml	Adds explicit nacos-client dependency to Spring Boot starter
agentscope-examples/boba-tea-shop/supervisor-agent/pom.xml	Adds nacos-client dependency to boba-tea-shop supervisor agent
agentscope-examples/pom.xml	Registers new a2a example module
agentscope-examples/a2a/pom.xml	Defines dependencies for A2A example including core, starters, and Spring Boot web
agentscope-examples/a2a/src/main/resources/logback.xml	Configures logging for the A2A example application
agentscope-examples/a2a/src/main/resources/application.yml	Provides application configuration with A2A and Nacos settings
agentscope-examples/a2a/.../ExampleTools.java	Implements demo tools (weather, calculator, time) for A2A agent
agentscope-examples/a2a/.../SimpleA2aAgentExample.java	Demonstrates basic A2A agent usage with well-known URI discovery
agentscope-examples/a2a/.../NacosA2aAgentExample.java	Demonstrates A2A agent usage with Nacos service discovery
agentscope-examples/a2a/.../A2aExampleApplication.java	Spring Boot application entry point with toolkit configuration
agentscope-examples/a2a/.../A2aAgentExampleRunner.java	Interactive CLI runner for testing A2A agents
agentscope-distribution/agentscope-all/pom.xml	Adds Nacos A2A extension to all-in-one distribution

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